/Engine/Plugins/Runtime/RigVM/Source/RigVMDeveloper/Public/RigVMModel/RigVMController.h
Update filtered permutations, and propagate both ways of the link before adding this link.
bool PrepareToLink ( [URigVMPin](API\Plugins\RigVMDeveloper\RigVMModel\URigVMPin) * FirstToResolve, [URigVMPin](API\Plugins\RigVMDeveloper\RigVMModel\URigVMPin) * SecondToResolve, bool bSetupUndoRedo )